"I'm very proud of the Iran nuclear agreement. I was very pleased to be part of what the president put into action when he took office. I was responsible for getting those sanctions imposed which put the pressure on Iran. It brought them to the negotiating table which resulted in this agreement," Clinton said during a Democratic party's presidential debate.

"We have to be sure that they are truly going to implement the agreement. We have to go after them on a lot of their other bad behaviour in the region which is causing enormous problems in Syria, Yemen, Iraq and elsewhere," she said.

Responding to a question on Syria, Clinton said her plan does not include American troops on the ground.

Clinton's main rival in the race to bag the Democratic presidential nomination, Bernie Sanders said the vacuum in the Middle East was created by the disastrous war in Iraq, which he vigorously opposed.

They have got to start putting in some skin in the game and not just ask the United States to do it," he said.

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